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The MvcContrib Grid component
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The MvcContrib Grid component
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The MvcContrib Grid is a UI component that creates a well-formed HTML table. It uses a fluent interface, which allows you to define the configuration of the Grid with a strongly typed and refactoring-friendly syntax. The refactoring support makes this style of component work nicely with refactoring tools like JetBrains ReSharper and DevExpress Refactor! Pro. This type of component generally requires a strongly typed view, which is used to drive the API of the Grid.
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Using the MvcContrib Grid One scenario where you might want to use a Grid like this would be to display a list of model objects. Listing 5.1 shows an action that will send an IEnumerable model to the view for rendering.
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Listing 5.1 An action that renders a list of Person objects
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public ActionResult AutoColumns() { return View(_peopleFactory.CreatePeople()); }
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The example in listing 5.1 ignores more advanced features like paging. It will simply send every Person object in the application to the view for rendering. The next step is to use the MvcContrib Grid to get a table-formatted view of our Person objects:
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<%= Html.Grid(Model).AutoGenerateColumns() %>
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The AutoGenerateColumns method will automatically generate columns in the table based on the public properties of the Person object, as shown in figure 5.1.
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The view produced by Grid.AutoGenerateColumns
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Consuming third-party components
This is only useful in certain situations. You ll see in figure 5.1 that there are some columns, such as Roles, for which the Grid doesn t know how to render a value. The default behavior is to call ToString on each property value, but this isn t particularly useful for complex types because it just displays the type name. AutoGenerateColumns is most useful if you re using a dedicated presentation model rather than a nested object hierarchy.
MvcContrib Grid advanced usage
Although the previous example of the MvcContrib Grid seemed to just work magically with a single line of view code, it has some pretty strong opinions about how it will render a model. For example, it assumes that all public properties should be rendered as columns (unless they re decorated with the ScaffoldColumn attribute). If you don t like this behavior, you do have more options and this is where the power of the Grid comes into play. Listing 5.2 shows how you can use the Grid to customize the output for individual columns.
Listing 5.2 Using the MvcContrib Grid with more control
<%= Html.Grid(Model).Columns(column => { column.For(x => x.Id).Named("Person ID"); column.For(x => x.Name); column.For(x => x.Gender); column.For(x => x.DateOfBirth).Format("{0:d}"); column.For(x => Html.ActionLink("View Person", "Show", new { id = x.Id})).DoNotEncode(); }) %>
In listing 5.2 the columns are explicitly specified by calling the Columns method, which makes use of a nested closure to configure which properties on the underlying model should be displayed as columns in the table. This is done by passing a lambda expression to the column.For method. By default, the name of the property will be used as the column heading, but this can be overridden by chaining a call to the Named method and providing a custom column name. Columns can be more complex than just including a simple property. For example, the final column in listing 5.2 defines a column that contains a hyperlink. The MvcContrib Grid created using the view code in listing 5.2 will render nicely in a table, as shown in figure 5.2. The main reason to explicitly specify the columns for the Grid is to be able to customize the output of various columns (for example, by using a custom string format or to add additional columns to the table). The syntax for defining the Grid may look odd at first it uses some of the newer features of the C# language. For example, lambda expressions are used to specify which properties should be rendered as columns in the table. By using this syntax, if you change the name of a property using a refactoring tool, the property gets
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